Experiment.
The superconducting materials discovery (experimental) community was also stimulated by the developments on SH\(_3\) .
Synthesis and evidence of superconductivity in lanthanum superhydride around 260K was announced in two publications[1]}, [2]} in 2018-2019. Resistivity drops occurred in the 180-200 GPa range for various runs upon cooling and heating, and xray diffraction established the fcc sublattice of La, as in the LaH\(_{10}\)  structural prediction.
Superconductivity was confirmed by Drozdov and collaborators, initially at 215K [Drozdov2018a] but soon thereafter up to 250K.[Drozdov2019]. The latter paper reported vanishing resistivity around 170 GPa, a H isotope effect, T\(_c\)  decreasing with applied magnetic field, and evidence of the predicted crystal structure.
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